code: def test_to_dict(self):
      documents = [
          Document(id="1", content="The answer is 42."),
          Document(id="2", content="I believe the answer is 42."),
          Document(id="3", content="42 is definitely the answer."),
      ]
      answer = GeneratedAnswer(
          data="42",
          query="What is the answer?",
          documents=documents,
          meta={"meta_key": "meta_value"},
      )
      assert answer.to_dict() == {
          "type": "haystack.dataclasses.answer.GeneratedAnswer",
          "init_parameters": {
              "data": "42",
              "query": "What is the answer?",
              "documents": [
                  d.to_dict(flatten=False) for d in documents
              ],
              "meta": {"meta_key": "meta_value"},
          },
      }
  
file_path: haystack/test/dataclasses/test_answer.py
imports: from pandas import DataFrame
  from haystack.dataclasses.answer import Answer, ExtractedAnswer, ExtractedTableAnswer, GeneratedAnswer
  from haystack.dataclasses.document import Document
label_desc: Use image node_id 3 for calling the TestGeneratedAnswer obj's underlying member method code with example usage: obj.test_to_dict() without return types